b-u bbb bbd bbi bbr bbs bbt bbu bby bdb bdd bdi bdr bds bdt bdu bdy bi- bib bid bii bir bis bit biu biy brb brd bri brr brs brt bru bry bsb bsd bsi bsr bss bst bsu bsy btb btd bti btr bts btt btu bty bub bud bui bur bus but buu buy by- byd byi byr bys byt byu dbb dbd dbi dbr dbs dbt dbu dby ddb ddd ddi ddr dds ddt ddu ddy di- dib did dii dir dis dit diu diy drb drd dri drr drs drt dru dry dsb dsd dsi dsr dss dst dsu dsy dtb dtd dti dtr dts dtt dtu dty dub dud dui dur dus dut duy dy- dyb dyd dyr dys dyu dyy i-d ibb ibd ibi ibr ibs ibt ibu iby idb idd idi idr ids idt idu idy iib iid iii iir iis iit iiu ir- irb ird iri irr irs irt iru iry is- isb isd isi isr iss ist isu isy itb itd iti its itt itu ity iu- iub iud iui iur ius iut iyr iys iyt iyy rbb rbd rbi rbr rbs rbt rbu rdb rdd rdi rdr rds rdt rdu rdy rib rid rii rir ris rit riy rrb rrd rri rrr rrs rrt rru rsb rsd rsi rsr rss rst rsu rtb rtd rti rtr rts rtt rtu rty rub rud rui rur rus rut ruu ruy ry- ryd ryr rys ryu ryy sbb sbd sbi sbr sbs sbt sbu sby sdb sdd sdi sdr sds sdt sdu sdy sib sid sii sir sis sit siu sr- srb srd sri srr srs srt sry ss- ssb ssd ssi ssr sss sst ssu stb std sti str sts stt stu sty sub sud sui sur sus sut suu suy sy- syb syd syi syr sys syt syu tbb tbd tbi tbr tbs tbt tbu tdb tdd tdi tdr tds tdt tdu tdy tib tid tii tir tis tit tiu tiy trb trd tri trr trs trt tru try tsb tsd tsi tsr tss tst tsu tsy ttb ttd tti ttr tts ttt ttu tty tub tud tui tur tus tut tuu tuy tyd tyr tys tyt ubb ubi ubr ubs ubt ubu uby udb udd udi udr uds udt udu uib uid uii uir uis uit uiu ur- urb urd uri urr urs urt uru ury usb usd usi usr uss ust usu utb utd uti utr uts utt utu uty uur uus uut uuu uyi uys uyu ybi ybr ybs yby yds ydt ydy yid yii yir yis yit yrs yrt yru ysb ysi ysr yss yst ysu ysy ytd ytr yts ytt ytu yud yui yur yus yut yuu yuy yyb yys yyt yyu yyy